Polishing machine



NOV. 28, R. GRUNWALD POLISHING MAHINE Filed Nov. 27, 1942 2 Sheets-Sheetl NOV. 28, R GRUNWALD POLISHING MACHINE Filed Nov. 27, 1942' 2Sheets-Sheet 2 havingrelatively1i small-@dimensions Patented'Nov. 28,1944y f yApplication;Nve'mber 2 iclms..

inventionV71 relatesffto `polishing-` or buing machines 'andvrmoreparticularlyj`y to a machine for polishing: the.' interior surfacesof articles" Heretoforefvbuing or polishing machines oftheltype--havinga driving pulley-a polishing head'fandlamendlessgbelthavebeen providedfor'v I buffinglor polishing articles.` `Generally such*machines'have'provided* at the polishing head y afsmallpulley'whiehi'enga'ged the other loop vend. of tliebelt.: fForpolislii1`1gsin1slots therehas been provided' in -placeof suchpulley apolishing plate i provided Lwith a bifurcated' member arranged ftopleti'n'g the: polishing it"i's-then again necessary tofstop-the-machineandtofremove-thefbelt- This consumes a' great amount o-f time withV theresult`thatthe processis slow:tndexpe'nsive- Inaccordance with' myinvention 4I have prelvddan arrangement!forfsimultan'eously polish-Vingtwo spacedlapartjsurfaces lin an article such aslabelt' buckleyWithout necessitatingany removalioflthe polishingjbelt Jor anycomplicated adjustment .procedure .y has been, accom`v plishedbyproviding apoli'shing head, which is adjustable in. positionr so as. rtoreadily vtension the...belt.a`nd` to ,providza ,beltplate aboutwhich tthe belt is passedlwhich is,- relatively; thin; and. narrc'ivv.` so thatthe ,v article to. be ,polished .may becslipped directly. over in place,thusgreatly, re,- ducing,Y ,the time-required 'for .polishing each are`t(.1e.4 l Q v Itcisg'gtherefore, an cvbjectl of; my inventionf toprovide a new andimprovedpolishing or,bumng,

machineparticularly s uited .for- =polishing. the in` y side.surfacescia-relatively small i article. u

@ther and `further. fobjeetsvofc rnyv invention will: f. becomemorefreadily;A apigiarent-` by;referencefto they following,description-1 taken; inf; connection.. i

Witlrftliei--accompanying drawings; 'Wlflerei'n-rI Figure-his a top{viewaof a polishing machine censtruetedl ,irnaccordanceWith.m55-invention: V

s'i-a'isideevimofthefmachinefshownn'f.

seciimtakenfalongetheqli 7, malsain# f Y and; are' vtop and; side viewsrespecafmodied,` form of f myinvention;l and rFig isia', full fsizeperspective vView of anarticleiofzantypei tol be'. polished by mymachine.

Referringjmore particularly to Figs. 1, 2,V and 3tfthereeisshovvnazpolishing'machine having'a f bas" I I which adjjacent'fone endsupportsa` flat' drivingipulley I2fwhich is operated Vfrom a suitable' 'sourcesof povvervvhich may compriseanI i:elec'ztricrmotork I3. Adiacent'itheAother 'end ofl the base1f-|`li theref'isf.. provided 1a polishing vheadcomprisingra'.bed'plate I4 .provided Withrslide- Ways: I ST-Which` inturn'. support a movable sliding;carriage I 6^: Thelbedfplate I lis'interconylinecsted with the slidingrcarriage I6A by meansofiam-laiddiistinglcscrem:Ifhiwhichisiprovidediwith"azimanualactiiating: device or l handle I8 in (the proximity-zofetheifrontriofi ther-L polishing 'headzl Preferably the adjustingscrew I1 and the operat r ingc'li'andle .e1 IM area; similazetoa. theAftypenoif screw utilizedxin the :construction of a bench vise.-v

"I'heislidable carriage: I6 is provided with .an

, uprightpostforrsupportipg'member vI 9 which may besfsecuredithereto byIsuitable` fastening means t cent theztop:thereofia-.transverse arm orbracket plates 23are each"- relatively long andpnarrowf" 'andinas/efAafroundedY edgeg25 which is arranged' tor-engageffone-lo'opoffapolishing belt 26.v In

thea'arrangement-rshownithere is providedA a` pair'offjbeltesupporting:plates.'23 whichv are spacedapartfandieachfis'provided with oneof a pair I'ZnwThe.- p air'ofbe1t`sf26f'are retained in posi- `tion:onffthev,longitudinallyAextending belt j plates 40 2lgbyyaipluralityrxof beltspacersfsuchasthereplaceahlef'block" 2.-'Ifv and thejrepl'aceable pins 28'.

Ihesel-f-bel-tfguidinge means if are made'v replaceable j since it?`hasrbeenf` found-thatthe",` edges i of the belt:whichL isf: coated with,an abrasive rapidly Y; ""wem1rthe spacingf'means: Supported -fromv anintermediate point1v onptheysupporting post` I9 there is-abellaspacer'and'v guide29 which may spacerrand v guide'Z 9@ is provided"with" suitable groovesl 323 for 4 b'eltsl 25.2` o i 'rhefbew bucklesueas-shown in Fig. emv;

asf

begseouredimposition by^a` bolt13l." The belt' guiding`A the under 'sideof thel ing/-faniouterframe133andan'intermediate cross Y member-:534.2isfy supported' in fa suitable-#jig and then plant-:dv uponz the-b'elt'lplates-u 23 fsomewhatas indicated bythe dotted lines in Fig. 1. The beltbuckle is then moved to a position such as shown by the dotted lines Ain Fig. 2, whereupon opposed edges 35 of the belt buckle 33 are polishedby a sort of oscillating rotating movement. The belt buckle is moved tothe dotted line position B of Fig. 2, whereupon two other opposedsurfaces such as the surfaces 36 of the buckle 33 are polished. Sincethe belt guide and spacing member 29 spaces the under side .of the belt26 away from vthe belt lplate 23 there is provided an arrangementwhereby two spaced apart and opposed surfaces may be polished at thesame time. The belt 26 has sufficient resiliency so as to permit somelatitude in the pressurev exerted oscillating it or rotating itbetween-,positions A and B of Fig. 2.

When it is desired to vpolish such surfaces sv the edges 31 and 38 ofthe buckle 33 the polishing head is provided with a wider flat plate 39shown inligs. 4 and 5, which supports a single belt dh The central guide21 is removed and where necessary new side guides 42 .serve in place 'oftheguides 23 of Fig. l.. The lower belt spreading and guide means '29 is.replaced by another spreading means ll3 which has a single slot orgroove M to accommodate the new belt 4|. The belt buckle' 33 isthereupon placed over the end of the belt plate 39 in the manner shownby the dotted lines of Figs. l and 5, whereupon the buckle is rotated oroscillated between two limits much in the manner as that described inkconnection with Fig. 2. From the above description it is believed and itwill become apparent that the present arrangement has many advantagesover the arrangement of theprior art and that the time required forpolishing small objects such as parachute buckles is greatly reduced.

While for the purposes of description and illustration a particularembodiment of my invention been set forth, it is to be understood that Ido not wish to be limitedjhereto since obviously'such modifications maybe made in the construction and in the instrumentalities employedl asmay be commensurate withv the scope of they appended claims.

-What I claim. as new and desire to secure by Letters Patent of theUnited States is:

l. The combination in a polishing machine comprisingr a base, a flatVdriving pulley positioned adjacent one end of said base, a polishinghead positioned adjacent the other end of' said base, a relativelynarrow endless polishing belt interconnecting said pulley and saidpolishing head, said polishing head comprising a bed l plate providedwith slideways arranged parallel to the direction of said belt, asliding carriage supported in said slideways, an'adjusting screwinterconnecting said carriage and saidbed plate,

means adjacent the front of said polishing head for manually actuatingsaid screw, a supporting post positioned yadjacent one side of saidcarriage, a transverse bracket extending therefrom, a lrelatively longnarrow polishing belt supporting plate supported b-y said bracket, saidpolishing belt supporting plate having a rounded edge for engagementwith one loop end of said belt, replaceable belt guide means supportedby said bracket, and a belt spacer supported from an intermediate pointon` said supporting post; said belt guide means acting to guide theupper run of said one loop end of said belt over said belt supportingplate, and said 'belt spacer acting to space the lower run offsaid oneloop end of said belt from the upper run thereof, whereby the upper andlower runs of said one loop end of said belt may be simultaneouslyemployed for the purposes described.

2. The combination in a polishing. machine comprising a flat drivingpulley, a polishing head spaced away from said driving pulley, a pair ofrelatively narrow endless polishing belts interconnecting said pulleyand said polishing head, said polishinghead comprising a ybed plateprovided with slideways arranged parallel to the direction of saidbelts, a carriage movably mounted in said slideways, and a manuallyactuated screw operable adjacent the front of said polishing head foradjusting the position of said carriage relative to said'be'd plate,upright supporting means positioned adjacent one side of said carriage,a transverse bracket extending therefrom, a pair of spaced apartrelatively long narrow polishing belt supporting plates mounted on'vsaid bracket, said polishing belt plates each projecting forwardly fromsaid'bracket beneath the upper run of one 'of said polishing belts andeach having a rounded edge for engagement with the forward loop end ofan associated polishing belt, and a belt spacer supported from anintermediate point on said upright supporting means above the lower runof both of said pair of polishing belts acting to space the lower runsof said belts from said polishing belt plates, whereby the upper andlower -runs of the forward loop ends of both of said polishing belts maybe simultaneously employed for the purposes described.

3. rThe combination in a lbuffing machine comprising a driving pulleyfor a buing belt, a buffing head for said belt spaced from said pulleyand positioned in alignment therewith, an endless bufling belt mountedon said pulley and said polishing head, said polishing head comprising amember provided with` slideways longitudinally arranged with respect to'said belt, a carriage mounted in said slideways, an adjusting screwinterconnecting said member and. said carriage, means for manuallyoperating said screw, an upright post mounted upon and adjacent one sideof .said carriage, an arm` extending transversely from the Vicinity ofAthe .top of `said post, a longitudinally extending plate projectingforwardly from saidarm beneath the upper forward run of said belt andhaving a rounded end over whichV said belt is returned, the top and theend of said plate being arranged to engage the inside of said belt, beltguiding meanssu-pported by said arm, and a vbelt spacer and guidetransversely positioned and supported :from an intermediate part of saidpost, also engaging the inside of said belt and acting to space andguide the lower forward run of said belt a predetermined distance fromthe upper forward run thereof, whereby the upper and lower forward runsof said polishing belt may be simultaneously employed for the purposesdescribed. l

4. The combinationina polishing machine comprising a driving pulley, anadjustably positioned polishing head aligned with and spaced from saiddriving pulley'and comprising a bed plate provided with slideways, acarriage suphaving a rounded edge arranged to engage one loop end of anendless polishing belt, said plate extending longitudinally within saidbelt and being spaced from said carriage, support means on saidvcarriage supporting said belt plate at one side thereof, meanssupported by said support means in spaced relation to said carriage andto said plate for spreading and guiding.. an endless polishing belt,manually adjustable screw means interconnecting vsaid carriage and saidbedplatel whereby the tension of a polishing beltmaybe readily adjusted,an endless polishing belt supported by said pulley, said belt plate andsaid spreading and guiding means, said belt being mounted to havefarelatively small loop end to permit slipping of Work thereover to bepolished,

whereby an upper and a. lower surface of the work may be polishedsimultaneously.l

RAYMOND GRUNWALD.

